My VX has been stood for about 6 months. Started it yesterday and the fuel pipe from the fuel filter split so couldn't run it at all. Replaced the pipe today and have noticed that the speedo isn't working when the truck is being driven, however when idling the speedo is bouncing around all over the place and adding mileage on. Anyone got any ideas what is causing this? There was a new sensor fitted on the trans last year that works the speedometer. This was fitted by a mechanic who didn't know what he was replacing and he replaced it instead of the speed sensors on the gearbox which needed replacing and it worked fine then.